<template>
  <div class="login_container">
    <el-row>
      <el-col :span="12" :xs="0"></el-col>
      <el-col :span="12" :xs="24">
        <el-form
          class="login_form"
          :model="loginForm"
          :rules="rules"
          ref="loginForms"
        >
          <h1>Hello</h1>
          <h2>欢迎来到硅谷甄选</h2>
          <el-form-item prop="username">
            <el-input
              :prefix-icon="User"
              v-model="loginForm.username"
            ></el-input>
          </el-form-item>
          <el-form-item prop="password">
            <el-input
              type="password"
              :prefix-icon="Lock"
              v-model="loginForm.password"
              show-password
            ></el-input>
          </el-form-item>
          <el-form-item>
            <el-button
              :loading="loading"
              type="primary"
              class="login_btn"
              @click="login"
            >
              登录
            </el-button>
          </el-form-item>
        </el-form>
      </el-col>
    </el-row>
  </div>
</template>

<script setup lang="ts">
import { User, Lock } from '@element-plus/icons-vue'
import { reactive, ref } from 'vue'
import { useRouter, useRoute } from 'vue-router'
import { ElNotification } from 'element-plus'
// 引入获取当前时间的函数
import { getTime } from '@/utils/time'
// 引入用户相关的小仓库
import useUserStore from '@/store/modules/user'
let useStore = useUserStore()
// 获取路由器
let $router = useRouter()
// 获取路由对象
let $route = useRoute()
// 定义变量控制按钮的加载效果
let loading = ref(false)
// 收集账号和密码的数据
let loginForm = reactive({ username: 'admin', password: '111111' })
// 获取表单元素
let loginForms = ref()
// 登录按钮的回调
const login = async () => {
  // 保证全部表单校验通过再发请求
  await loginForms.value.validate()
  // 加载效果
  loading.value = true
  // 点击登录按钮业务
  // 通知仓库发登录请求
  // 请求成功->首页
  // 请求失败->登录失败信息
  try {
    // 保证登录成功
    await useStore.userLogin(loginForm)
    // 判断登录时，路径中是否有query参数
    let redirect = $route.query.redirect
    // 编程式导航跳转到展示数据首页
    $router.push({ path: redirect ? String(redirect) : '/' })
    // 登录成功的提示消息
    ElNotification({
      type: 'success',
      message: '登录成功',
      title: `Hi, ${getTime()}好`,
    })
    loading.value = false
  } catch (error) {
    loading.value = false
    // 登录失败的提示消息
    ElNotification({
      type: 'error',
      message: (error as Error).message,
    })
  }
}
// 自定义校验规则函数
const validatorUserName = (rule: any, value: any, callback: any) => {
  // rule: 校验规则对象
  // value: 表单元素文本内容
  // callback: 符合条件放行 不符合注入错误提示消息
  if (/^[\w-]{4,16}$/.test(value)) {
    callback()
  } else {
    callback(new Error('账号长度为4-16位'))
  }
}
const validatorPassword = (rule: any, value: any, callback: any) => {
  if (value.length >= 6) {
    callback()
  } else {
    callback(new Error('密码不符合规则'))
  }
}
// 定义表单校验需要配置对象
const rules = {
  // 规则对象属性:required，代表这个字段务必校验的
  // min:至少多少位
  // max:至多多少位
  // message:错误的提示信息
  // trigger:触发校验表单的时机
  username: [{ trigger: 'change', validator: validatorUserName }],
  password: [{ trigger: 'change', validator: validatorPassword }],
}
</script>

<style scoped lang="scss">
.login_container {
  width: 100%;
  height: 100vh;
  background: url('@/assets/images/background.jpg') no-repeat;
  background-size: cover;
  .login_form {
    position: relative;
    width: 80%;
    top: 30vh;
    background: url('@/assets/images/login_form.png') no-repeat;
    background-size: cover;
    padding: 40px;
    h1 {
      color: white;
      font-size: 40px;
    }
    h2 {
      color: wheat;
      font-size: 20px;
      margin: 20px 0;
    }
    .login_btn {
      width: 100%;
    }
  }
}
</style>
